Anthracnose control failures
September 23, 2012
We have seen several dramatic anthracnose control failures in the past. In most cases, the cause was use of QoI fungicides such as Compass (trifloxystrobin), Insignia (pyraclostrobin) or Heritage (azoxystrobin) — products that failed because anthracnose has developed resistance to them in many locations.
When QoI fungicides such as Heritage were first introduced in the 1990s, they were very effective against anthracnose. However, starting around 1999, we began to see serious control failures when Heritage was used to combat this…